<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style>
 table{ border:1px solid #000000;}
</style>
</head>
<body>

<table style=" background-color:red; height:100px; width:100px" id="u1" >
</table>
<br />
<table style=" background-color:blue; height:100px; width:100px" id="u2" >
<thead>
</thead>
</table>
<br />
<table style=" background-color:black; height:100px; width:100px" id="u3" >
<tbody></tbody>
</table>
<br />
<table style=" background-color:yellow; height:100px; width:100px" id="u4" >
<tfoot><tr></tr></tfoot>
</table>
<table style=" background-color:green; height:100px; width:100px" id="u5" >
<tr></tr>
</table>
<table style=" background-color:plum; height:100px; width:100px" id="u6" >
<tr><td>不为空</td></tr>
</table>
<table style=" background-color:#FF00FF; height:100px; width:100px" id="u6" >
<COLGROUP SPAN="3" STYLE="color:gren;background:black">
<!-- 样式仅应用于前两列，而不是所有的三列，而且字
体是红色而不是绿色。这是 COL 元素的标签属性导致的。 -->
<COL STYLE="color:red">
</COLGROUP>

</table>
</body>
</html>
